Status: Accepted
Owner: Vinzent.Steinberg
Labels: Type-Defect Priority-Medium
New issue 2131 by Vinzent.Steinberg: failing limit
http://code.google.com/p/sympy/issues/detail?id=2131
This should not raise a ZeroDivisionError. (Even if the limit does not
exists.)
In [15]: limit(diff(x**3*sin(1/x), x) / x, x, 0)
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (63, 0))
---------------------------------------------------------------------------
ZeroDivisionError Traceback (most recent call last)
/home/one/src/sympy/<ipython console> in <module>()
/home/one/src/sympy/sympy/series/limits.pyc in limit(e, z, z0, dir)
77 r = gruntz(e, z, z0, dir)
78 except PoleError:
---> 79 r = heuristics(e, z, z0, dir)
80 return r
81
/home/one/src/sympy/sympy/series/limits.pyc in heuristics(e, z, z0, dir)
87 for a in e.args:
88 if not a.is_bounded:
---> 89 r.append(a.limit(z, z0, dir))
90 if not (r is []):
91 return Mul(*r)
/home/one/src/sympy/sympy/core/expr.pyc in limit(self, x, xlim, direction)
744 """
745 from sympy.series.limits import limit
--> 746 return limit(self, x, xlim, direction)
747
748 @cacheit
/home/one/src/sympy/sympy/series/limits.pyc in limit(e, z, z0, dir)
59 finite = []
60 for term in e.args:
---> 61 result = term.subs(z, z0)
62 if result.is_unbounded or result is S.NaN:
63 unbounded.append(term)
/home/one/src/sympy/sympy/core/basic.pyc in subs(self, *args)
703 elif len(args) == 2:
704 old, new = args
--> 705 return self._subs_old_new(old, new)
706 else:
707 raise TypeError("subs accepts either 1 or 2 arguments")
/home/one/src/sympy/sympy/core/cache.pyc in wrapper(*args, **kw_args)
83 except KeyError:
84 pass
---> 85 func_cache_it_cache[k] = r = func(*args, **kw_args)
86 return r
87
/home/one/src/sympy/sympy/core/basic.pyc in _subs_old_new(self, old, new)
712 old = sympify(old)
713 new = sympify(new)
--> 714 return self._eval_subs(old, new)
715
716 def _eval_subs(self, old, new):
/home/one/src/sympy/sympy/core/mul.pyc in _eval_subs(self, old, new)
941 if myFlag == True:
942 return Mul(coeff_self/coeff_old, new,
--> 943
Mul(*comms_final)._eval_subs(old,new))#*[c._eval_subs(old,new) for c in
comms_final])
944 else:
945 return self.__class__(*[s._eval_subs(old, new)
for
/home/one/src/sympy/sympy/core/function.pyc in _eval_subs(self, old, new)
165 elif isinstance(new.nargs,tuple) and self.nargs in
new.nargs:
166 return new(*self.args)
--> 167 return Basic._seq_subs(self, old, new)
168
169
/home/one/src/sympy/sympy/core/basic.pyc in _seq_subs(self, old, new)
797 else:
798 args = (self.func,)+self
--> 799 return self.func(*[s.subs(old, new) for s in args])
800
801 def __contains__(self, what):
/home/one/src/sympy/sympy/core/multidimensional.pyc in wrapper(*args,
**kwargs)
134 result = apply_on_element(wrapper, args,
kwargs, n)
135 return result
--> 136 return f(*args, **kwargs)
137 wrapper.__doc__ = f.__doc__
138 wrapper.__name__ = f.__name__
/home/one/src/sympy/sympy/core/cache.pyc in wrapper(*args, **kw_args)
83 except KeyError:
84 pass
---> 85 func_cache_it_cache[k] = r = func(*args, **kw_args)
86 return r
87
/home/one/src/sympy/sympy/core/function.pyc in __new__(cls, *args,
**options)
210 # UC: Function('f')(x)
211 # UC: sin(x)
--> 212 return Application.__new__(cls, *args, **options)
213
214
/home/one/src/sympy/sympy/core/multidimensional.pyc in wrapper(*args,
**kwargs)
134 result = apply_on_element(wrapper, args,
kwargs, n)
135 return result
--> 136 return f(*args, **kwargs)
137 wrapper.__doc__ = f.__doc__
138 wrapper.__name__ = f.__name__
/home/one/src/sympy/sympy/core/cache.pyc in wrapper(*args, **kw_args)
83 except KeyError:
84 pass
---> 85 func_cache_it_cache[k] = r = func(*args, **kw_args)
86 return r
87
/home/one/src/sympy/sympy/core/function.pyc in __new__(cls, *args,
**options)
108 if options.get('evaluate') is False:
109 return super(Application, cls).__new__(cls, *args,
**options)
--> 110 evaluated = cls.eval(*args)
111 if evaluated is not None:
112 return evaluated
/home/one/src/sympy/sympy/functions/elementary/trigonometric.pyc in
eval(cls, arg)
301 q = pi_coeff.q
302
--> 303 Q, P = 2*p // q, p % q
304
305 try:
ZeroDivisionError: integer division or modulo by zero
(Background: The second derivative of 'x**3 * sin(1/x) if x != 0 else 0' in
0.)
--
You received this message because you are subscribed to the Google Groups
"sympy-issues" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sympy-issues?hl=en.
